Condenser



June 11, 1929. J. MERRILL CONDENSER Filed July 5, 1924 rtaaaa'im 11,1529. I I

UNITED STATES PATENT OFFICE.

' L. MEBRILIJOF MEDIA, PENNSYLVANIA.

CONDENSER.

- Application filed July 5,1924. Serial No. 784,456.

This invention is an electrical condenser F constructed to prevent elect'ricallosses at the aluminum foil, or the like,

' ished condenser is materially points where the leads are joined with the conductor material of the condenser structure;

. Heretofore it has been common practice to construct electrical condensers of alternate layers of dielectric material and conducting material. These two materials are assemble by various methods, ordinary parafiin-coated paper being commonly used as the dielectric, and tinfoil or the like, as the conductive material. In condensers of this type however, as serious problem is presented in properly uniting the leads which extend to the con denser terminals, with the conductive material. The usual practice is to attach fine wires to the foil in various .ways,-and having said wires extended laterally from the foil so that they may be connected to the condenser terminals. Owing to the thinness of the tin or it is practically impossible to obtain anything like a perfect connection between the wire lead and'thefoil, andas a consequence the efficiency of the finlowered by reason of the leakage at such pointsof union.

Qne of the'objects of the invention is to overcomethe foregoing objections, by provitling a condenser having its leads so constructed as to practically avoid electrical loss at the points where the leads extend from the electrical material. A further-object is to provide layers of tin or aluminum foil, or the like,- having terminal portions shaped to provide integral leads, whereby joints between the leads andthe foil are avoided and a maximum efliciency is assur The invention will beherein fter' fully set forth and claims.

In the accompanyingdrawingz- Figure 1 is a perspective view illustratin an" electric condenser,-constructed'in accor f -anpe withthe nvent1on,-port1ons of the elec f .trio and dielectric elements 'bein unrolled: Figure 2is a diagrammatic View lllustratin the method of forming the condenser lead.

Figure 3 is a similar view of a slight modification.

Referring to the drawing, 10 designates a sheet of tin or aluminum foil, and .11 a sheet of parafiin-coated paper, which sheets are rolled together" and flattened, as indicated at 13. It is-tobe understood that the foregoing arrangement is shown and described tion, a number of times,

parallel with the faces of In lieu of folding the sheet 10 to provide.

the electricinaterial are extension of the tin or particularly pointed out in the merely for illustrative purposes, for the reamaterial with respbct to the sheets of tin oraluminum foil.

The end ofthe'foil sheet 10 is consecutively folded back upon itself in a. diagonal posias indicated at 14, to form a plurality of layers 15, with the extremity or raw -edgeof the sheet enclosed within the fold. The effect of the folding as thus described, is to causea narrowly folded portion 16 of the foil to extend diagonally and laterally beyondthe upper edge of the foil sheet, the extremity of the sheet being turned in and protected in a manner that wsill prevent it from being torn (see Figure 2 twisted rolled, or otherwise shaped for ready and con venient connection with the usual terminal of the condenser, and bent at an angle the sheet material.

the lateral extension, dic'ated at 17 ,Figure produce the folds.

From the foregoin it'will be readil it may be rolled as in- 3, and then flattened to seen that joints between t e-condenser lea s and avoided and that this effect is obtained by producing an.,integral and shaping it to form the condenser lead. By this-means the expense of manufacture is not at all increased, and yet a maximum efliciency due to the reduction of electric losses at those oints where the leads extend\from the foil s eets is assured.

Having thus explained the nature of the invention and described an operative manner of constructing and using the same, although of t e without attempting to set forth all orms in which it may be made,.or all of the orms of its use, what is claimed is 1. A 'condenser'of the character described g comprising sheets of dielectric material and sheets of metal foil, one end of each foil sheet having an. integral condenser-lead-extension formed of a portion of the sheet wound upon one corner 0 the said end in a diagonal line extending transversely of-the sheet, so that The lateral extended portion 16,- "is aluminum. foil sheet,

said corner lies within the innermost fol' d' and is enclosed and covered-b the successive folds whlch are woulirl aroun 1t.

2. A condenser of the character described comprising sheets of dielectric material and sheets of metal foil, one end of each foil sheet having an integral condenser-lead-extension formed of a portion of the sheet wound upon one corner of the said end in a diagonal line extending transversely of the sheet, so that a portion of the wound portion projects beyond one edge of said sheet, and said corner lies within the innermost fold and is enclosed and covered by the successive folds which are wound upon it, said projecting portion being disposed at an angle to the rest of the lead and also with respect to said sheet. I

3. A condenser of the character described comprising sheets of dielectric material and tion. a

In testimony whereof I have hereunto set my'hand.

JOSIAH L. MERRILL. 

